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SystemVerilog defines different levels of type compatibility. * Matching * Equivalent * Assignment compatible * Cast compatible At the moment the `nettype_t` has only one type compatibility test. It is used to check assignment compatibility when assigning to a dynamic array, queue or class. The current implementation rejects a few cases that should allowed and allows a few cases that should be rejected. Dynamic arrays and queues are assignment compatible if their element types are compatible. And two packed types are equivalent if they are both 2-state or 4-state, both signed or unsigned and have the same packed with. In the current implementation the sign is not considered and instead of checking if the packed width is the same it checks that the dimensions are identical. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
/*
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* Copyright (c) 2012-2020 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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# include "netdarray.h"
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# include "netqueue.h"
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# include <iostream>
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using namespace std;
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netdarray_t::netdarray_t(ivl_type_t vec)
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: netarray_t(vec)
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{
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}
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netdarray_t::~netdarray_t()
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{
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}
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ivl_variable_type_t netdarray_t::base_type(void) const
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{
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return IVL_VT_DARRAY;
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}
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bool netdarray_t::test_equivalence(ivl_type_t that) const
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{
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// Queues and dynamic arrays are not equivalent, so check for the base
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// type to make sure both are either dynamic array or queue.
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if (base_type() != that->base_type())
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return false;
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return test_compatibility(that);
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}
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bool netdarray_t::test_compatibility(ivl_type_t that) const
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{
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// This will match both queues and dynamic arrays
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const netdarray_t *that_da = dynamic_cast<const netdarray_t*>(that);
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if (!that_da)
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return false;
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return element_type()->type_equivalent(that_da->element_type());
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}
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